Semiconductor device and method of manufacturing the same

ABSTRACT

A first electronic circuit component and a second electronic circuit component are electrically connected to an electro-conductive member via a first solder and a second solder, respectively. The electro-conductive member is formed in a resin film. The electro-conductive member is configured as containing a second diffusion barrier metal film. The second diffusion barrier metal film prevents diffusion of the second solder. Between the electro-conductive member and the first solder, a first diffusion barrier metal film is provided. The first diffusion barrier metal film prevents diffusion of the first solder. On the first surface of the resin film and on the electro-conductive member, an adhesive metal film is formed so as to contact with the resin film and the electro-conductive member. The adhesive metal film has stronger adhesiveness to the resin film than either of those of the first solder and the first diffusion barrier metal film.

This application is based on Japanese patent application No. 2006-121575the content of which is incorporated hereinto by reference.

BACKGROUND

1. Technical Field

The present invention relates to a semiconductor device and a method ofmanufacturing the same, and in particular to a semiconductor devicehaving a solder bump electrode and a method of manufacturing the same.

2. Related Art

One example of conventionally-known semiconductor devices can be foundin Japanese Laid-Open patent publication No. H6-140465 (patent document1). The semiconductor device described in this document includes aninsulating base material typically composed of a polyimide film, having,as being mounted on both surfaces thereof, an IC chip having solder bumpelectrodes, and a circuit wiring board having solder bump electrodes. ACu film is brought into close contact with the insulating base material.Prior art documents relevant to the present invention other than thepatent document 1 includes Japanese Laid-Open patent publications No.H11-345933 (patent document 2) and No. 2001-217388 (patent document 3).

SUMMARY OF THE INVENTION

However in the semiconductor device described in the patent document 1,a solder material composing the solder bump electrodes diffuses throughthe Cu film, reaches the interface between the insulating base materialand the Cu film, and consequently the insulating base material and theCu film become more likely to separate from each other.

According to the present invention, there is provided a semiconductordevice including: an insulating film; an electro-conductive memberprovided in the insulating film; a first electronic circuit componentprovided on a first surface side of the insulating film, andelectrically connected to the electro-conductive member via a firstsolder; a second electronic circuit component provided on a secondsurface side, which is opposite to the first surface side, of theinsulating film, and electrically connected to the electro-conductivemember via a second solder; a first diffusion barrier metal filmprovided between the electro-conductive member and the first solder, andpreventing diffusion of the first solder; a second diffusion barriermetal film constituting at least a part of the electro-conductivemember, and preventing diffusion of the second solder; and an adhesivemetal film provided on the first surface of the insulating film and onthe electro-conductive member as being brought into contact with theinsulating film and the electro-conductive member, and havingadhesiveness to the insulating film stronger than the adhesiveness ofthe first solder and the adhesiveness of the first diffusion barriermetal film.

In this semiconductor device, the first diffusion barrier metal film isprovided between the adhesive metal film and the first solder, and thesecond diffusion barrier metal film is provided between the adhesivemetal film and the second solder. By contribution of these diffusionbarrier metal films, the solder can be prevented from reaching theinterface between the insulating film and the adhesive metal film. As aconsequence, a semiconductor device less likely to cause separationbetween the insulating film and the adhesive metal film can be realized.

According to the present invention, there is also provided a method ofmanufacturing a semiconductor device including: forming, in aninsulating film, an electro-conductive member, at least a part of whichis constituted by a second diffusion barrier metal film; forming, on theinsulating film and on the electro-conductive member, an adhesive metalfilm so that the adhesive metal film is brought into contact with theinsulating film and the electro-conductive member; forming, on theadhesive metal film, a first diffusion barrier metal film; placing, onthe first diffusion barrier metal film, a first electronic circuitcomponent via a first solder so that the first electronic circuitcomponent is electrically connected to the electro-conductive member;and placing, on a side of the insulating film opposite to the firstelectronic circuit component, a second electronic circuit component viaa second solder so that the second electronic circuit component iselectrically connected to the electro-conductive member, wherein theadhesive metal film has adhesiveness to the insulating film strongerthan the adhesiveness of the first solder and the adhesiveness of thefirst diffusion barrier metal film, and the first and second diffusionbarrier metal films prevent diffusion of the first and second solders,respectively.

This method includes a step of forming an electro-conductive memberconfigured in at least a part thereof by using a second diffusionbarrier metal film, and a step of forming the first diffusion barriermetal film on the adhesive metal film. As a consequence, themanufactured semiconductor device has the first diffusion barrier metalfilm provided between the adhesive metal film and the first solder, andhas also the second diffusion barrier metal film provided between theadhesive metal film and the second solder. By contribution of thesediffusion barrier metal films, the solder can be prevented from reachingthe interface between the insulating film and the adhesive metal film.As a consequence, a semiconductor device less likely to cause separationbetween the insulating film and the adhesive metal film can be realized.

According to the present invention, a semiconductor device lesscausative of separation between the insulating film and the adhesivemetal film, and a method of manufacturing such semiconductor device, canbe realized.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, advantages and features of the presentinvention will be more apparent from the following description taken inconjunction with the AC companying drawings, in which:

FIG. 1 is a sectional view showing an embodiment of the semiconductordevice of the present invention;

FIG. 2 is a sectional view showing a part of the semiconductor deviceshown in FIG. 1;

FIG. 3 is a plan view showing a part of the semiconductor device shownin FIG. 1;

FIGS. 4A to 4C are drawings showing process steps of an embodiment ofthe method of manufacturing a semiconductor device of the presentinvention;

FIGS. 5A to 5C are drawings showing process steps of an embodiment ofthe method of manufacturing a semiconductor device of the presentinvention;

FIGS. 6A to 6C are drawings showing process steps of an embodiment ofthe method of manufacturing a semiconductor device of the presentinvention;

FIGS. 7A to 7C are drawings showing process steps of an embodiment ofthe method of manufacturing a semiconductor device of the presentinvention;

FIGS. 8A and 8B are drawings showing process steps of an embodiment ofthe method of manufacturing a semiconductor device of the presentinvention;

FIGS. 9A and 9B are drawings showing process steps of an embodiment ofthe method of manufacturing a semiconductor device of the presentinvention;

FIG. 10 is a sectional view explaining a modified example of theembodiment;

FIG. 11 is a sectional view explaining another modified example of theembodiment;

FIG. 12 is a sectional view explaining another modified example of theembodiment;

FIG. 13 is a sectional view explaining another modified example of theembodiment;

FIG. 14 is a sectional view explaining another modified example of theembodiment;

FIG. 15 is a sectional view explaining another modified example of theembodiment; and

FIG. 16 is a sectional view explaining another modified example of theembodiment.

DETAILED DESCRIPTION

The invention will now be described herein with reference to anillustrative embodiment. Those skilled in the art will recognize thatmany alternative embodiments can be accomplished using the teachings ofthe present invention and that the invention is not limited to theembodiment illustrated for explanatory purposes.

Paragraphs below will detail the embodiments of the semiconductor deviceand the method of manufacturing the same according to the presentinvention, referring to the attached drawings. It is to be noted that,in the explanation of the drawings, any similar components will be givenwith the same reference numerals, so as to avoid repetitive explanation.

FIG. 1 is a sectional view showing an embodiment of the semiconductordevice according to the present invention. FIG. 2 is a sectional viewshowing a part of the semiconductor device. This drawing shows a portionand around surrounded by a circle C1 shown in FIG. 1. FIG. 3 is a planview showing a part of the semiconductor device. The semiconductordevice 1 has a semiconductor chip 10 (first electronic circuitcomponent), and a semiconductor chip 20 (second electronic circuitcomponent). The semiconductor chip 10 and the semiconductor chip 20 are,for instance, LSI chips. The semiconductor chip 10 is covered with amolding resin 82. Connective portions 30 of the semiconductor chip 10and the semiconductor chip 20 are electrically connected to externalelectrode terminals 90 of the semiconductor device 1, by interconnects70. The external electrode terminal 90 is, for instance, a BGA (ballgrid array).

A configuration of the connective portions 30 will be explained below,referring to FIG. 2. In a resin film 50 (insulating film),electro-conductive members 40 are formed. The thickness of the resinfilm 50 is, for instance, 5 to 10 μm. The thickness is preferably 20 μmor below. The resin film 50 can be exemplified by an epoxy resin film,BT resin film, polyimide resin film, and so forth.

Each electro-conductive member 40 is composed of a Cu film 42 and a Nifilm 44 (second diffusion barrier metal film). The Ni film 44 preventsdiffusion of a solder 24 described later. As is obvious from thedrawing, the Ni film 44 in this embodiment exposes to a surface Si(first surface) of the resin film 50, and the Cu film 42 exposes to asurface S2 (second surface) of the resin film 50. In other words, thesurficial layer of the electro-conductive member 40 on the surface S1side is composed of the Ni film 44, and the surficial layer of theelectro-conductive member 40 on the surface S2 side is composed of theCu film 42. The thickness of the Cu film 42 is, for instance, 2 to 5 μm.The thickness of the Ni film 44 is, for instance, 3 to 5 μm.

The semiconductor chip 10 and the semiconductor chip 20 are provided onthe surface Si side and on the surface S2 side of the resin film 50,respectively. The semiconductor chip 10 and the semiconductor chip 20are electrically connected to the electro-conductive members 40, viasolders 14 (first solders) and solders 24 (second solders),respectively.

Between the electro-conductive members 40 and the solders 14, a Ni film66 (first diffusion barrier metal film) is provided. The Ni film 66prevents diffusion of the solders 14. On the surface S1 of the resinfilm 50 and on the electro-conductive members 40, a Ti film 62 (adhesivemetal film) is formed so as to contact with the resin film 50 and theelectro-conductive members 40. The Ti film 62 has adhesiveness to theresin film 50 stronger than either of those of the solders 14 and the Nifilm 66. As this sort of adhesive metal film, a metal film havingadhesiveness to the resin film 50 stronger than that of the Cu film isused. Degree of the adhesiveness herein can be measured by peeling testsuch as tape peeling. Because the Ni film 44 is provided in thesurficial layer of the electro-conductive member 40 on the surface Siside, the Ni film 44 and the Ti film 62 are brought into contact witheach other. In this embodiment, a Cu film 64 is provided between the Tifilm 62 and the Ni film 66.

Each solder 14 described in the above has one end connected to anelectrode 12 of the semiconductor chip 10, and the other end connectedto the Ni film 66. Each solder 24 has one end connected to an electrode22 of the semiconductor chip 20, and the other end connected to the Cufilm 42 of the electro-conductive member 40. As is obvious from FIG. 2,each solder 24 is brought into contact with the electro-conductivemember 40, on the surface S2 of the resin film 50. In other words, inthe semiconductor device 1, the electro-conductive member 40 and thesolder 24 are connected to each other without placing a pad or the liketherebetween.

On the surface S1 of the resin film 50, interconnects 70 are formed. Theinterconnects 70 contain a material composing the adhesive metal film(Ti in this embodiment). More specifically, the interconnects 70 arecomposed of a Ti film 72, a Cu film 74 and a Ni film 76. These Ti film72, Cu film 74 and Ni film 76 are stacked in this order on the surfaceS1. In other words, the interconnects 70 have a stacked structure sameas the stacked structure composed of the Ti film 62, the Cu film 64 andthe Ni film 66. The gap between the semiconductor chip 10 and the resinfilm 50 is filled with an underfill resin 84. Similarly, the gap betweenthe semiconductor chip 20 and the resin film 50 is filled with anunderfill resin 86.

As has been described in the above, in the semiconductor device 1, thesemiconductor chip 10 and the semiconductor chip 20 are connectedthrough their respective electrodes 12, 22, while opposing thecircuit-forming surfaces with each other. Between these semiconductorchips 10, 20, there is the resin film 50 holding the interconnects 70,wherein the resin film 50 has, as being formed therein, holes used forconnection. In the holes, the electro-conductive members 40 are formed.On a virtual line connecting the electrode 12 and the electrode 22, thesolder 14, the Ni film 66, the Cu film 64, the Ti film 62, theelectro-conductive member 40 and the solder 24 are provided as viewedfrom the electrode 12 side.

In this embodiment, an Au film (first Au film) in contact with thesolder 14 may be provided on the Ni film 66. It is also allowable toprovide an Au film (second Au film) in contact with the solder 24, onthe Cu film 42 of the electro-conductive members 40.

An exemplary method of manufacturing the semiconductor device 1 will bedescribed as an embodiment of the method of manufacturing asemiconductor device of the present invention, referring to FIG. 4A to9B. This method includes steps (a) to (g) below:

(a) forming the resin film 50 on a supporting substrate, prior toforming the electro-conductive members 40 (FIG. 4A to FIG. 4C);

(b) forming the electro-conductive members 40 in the resin film 50 (FIG.5A);

(c) forming the Ti film 62 on the resin film 50 and on theelectro-conductive members 40, so as to contact with the resin film 50and the electro-conductive members 40 (FIG. 5B to FIG. 5C);

(d) forming the Ni film 66 on the Ti film 62 (FIG. 6A to FIG. 6C);

(e) placing the semiconductor chip 10 on the Ni film 66 via the solder14, so that the semiconductor chip 10 is electrically connected to theelectro-conductive members 40 (FIG. 7A to FIG. 7C);

(f) removing the supporting substrate, posterior to the placing thesemiconductor chip 10, and prior to the placing the semiconductor chip20 (FIG. 8A to FIG. 8B); and

(g) placing the semiconductor chip 20 on a side of the resin film 50opposite to the semiconductor chip 10 via the solder 24, so that thesemiconductor chip 20 is electrically connected to theelectro-conductive members 40 (FIG. 9A to FIG. 9B).

In more detail, first a supporting substrate 92 such as a siliconsubstrate or the like is prepared (FIG. 4A). On the supporting substrate92, a Cu film having a thickness of 0.2 μm or around is formed bysputtering as a plating seed layer 94 (FIG. 4B). Photo-sensitivepolyimide is coated on the plating seed layer 94, dried, rinsed on theedge, subjected to light exposure and development, so as to form apredetermined pattern. The resin film 50 having holes 50 a is thusformed (FIG. 4C).

Next, the Cu film 42 having the thickness of 3 μm or around and the Nifilm 44 having the thickness of 3 μm or around are formed by electrolessplating in the holes 50 a (FIG. 5A). After an oxide film on the surfaceof the Ni film 44 is removed by Ar plasma etching, the Ti film 62 andthe Cu film 64 are formed as a sputtered seed film (FIG. 5B). Aphotoresist R1 is coated on the Cu film 64, dried, and subjected tolight exposure and development so as to form predetermined openings(FIG. 5C).

Next, a Cu film having the thickness of 3 μm or around, a Ni film havingthe thickness of 6 μm or around, and a Au film having the thickness of 1μm or around are sequentially formed in the openings of the photoresistR1 by electroless plating (FIG. 6A). The Cu film, the Ni film and the Aufilm will collectively be referred to as an interconnect film 60,hereinafter. Next, the photoresist R1 is removed by solvent cleaning(FIG. 6B). The Ti film 62 and the Cu film 64 are then removed by wetetching selectively in portions having no interconnect film 60 formedthereon (FIG. 6C).

Next, each of the electrodes (not shown) of the semiconductor chip 10 isconnected to the interconnect film 60 via the solder 14 (FIG. 7A). Thegap between the semiconductor chip 10 and the resin film 50 is filledwith the underfill resin 84 (FIG. 7B). The molding resin 82 is formed soas to cover the semiconductor chip 10 (FIG. 7C).

Next, the supporting substrate 92 is removed (FIG. 8A). The supportingsubstrate 92 can be removed, for instance, by using grinding,chemical-mechanical polishing, etching or the like. Next, the platingseed layer 94 is removed by wet etching (FIG. 8B). On the Cu film 42exposed as a result of removal of the supporting substrate 92 and theplating seed layer 94, a Au film 43 is formed by electrolesssubstitutive Au plating (FIG. 9A). Each of the electrodes (not shown) ofthe semiconductor chip 20 is connected to the Au film 43 via the solder24. The gap between the semiconductor chip 20 and the resin film 50 isfilled with the underfill resin 86 (FIG. 9B). The semiconductor device 1shown in FIG. 1 is obtained in this way.

Effects of this embodiment will be explained. In this embodiment, the Nifilm 66 is provided between the Ti film 62 and the solders 14, and theNi film 44 is provided between the Ti film 62 and the solders 24. Bycontribution of the Ni film 66, the material composing the solders 14can be prevented from reaching the interface between the resin film 50and the Ti film 62. Similarly, by contribution of the Ni film 44, thematerial composing the solders 24 can be prevented from reaching theabove-described interface. As a consequence, a semiconductor device lesslikely to cause separation between the resin film 50 and the Ti film 62,and a method of manufacturing the same, can be realized.

In contrast, the semiconductor device described in the patent document 1has no Ni film or the like as the diffusion barrier metal film, so thatthe solder is more likely to diffuse through the Cu film, and to reachthe interface between the Cu film and the insulating base material. Oncethe solder reaches the interface, adhesiveness between the insulatingbase material and the Cu film degrades, and thereby difference in stressbetween the insulating base material and the Cu film will result inseparation at the interface between the insulating base material and theCu film. What is worse, the separation described above further inducesseparation at the interface between the metal film in the insulatingbase material and the Cu film. This is because the separation betweenthe insulating base material and the Cu film induces concentration ofstress at the interface between the above-described metal film and theCu film.

The semiconductor device described in the patent document 2 has providedtherein a diffusion barrier metal film composed of Ti/Ni/Pd, between anelectro-conductive paste and solders. However, there is no adhesivemetal film provided as being close contact with the resin film. Thesemiconductor device described in the patent document 3 hassemiconductor chips mounted on both surfaces of a flexible substrate.There is, however, no diffusion barrier metal film preventing diffusionof solders provided thereto.

Unlike the patent documents 1-3, this embodiment successfully achieves ahigh level of adhesiveness between the adhesive metal film and the resinfilm, by providing the diffusion barrier metal film on both sides of theadhesive metal film as described in the above. In the semiconductordevice described in the patent document 1, a possible method ofimproving the adhesiveness of the Cu film to the insulating basematerial may be roughening of the surface of the Cu film. A disadvantagemay, however, arise in this case in that the formation of fine patternsbecomes difficult.

Further in this embodiment, the Ni film 44 is in contact with the Tifilm 62. By virtue of this configuration, the solder material composingthe solders 24 is successfully prevented from reaching the interfacebetween the Ni film 44 and the Ti film 62, even when the solder materialdiffuses into the Cu film 42 in the resin film 50.

The solders 24 are in contact with the electro-conductive members 40 onthe surface S2. This configuration can reduce the number of processsteps, as compared with the case where pads are formed on the surfaceS2, and the solders 24 and the electro-conductive members 40 areconnected via the pads. This configuration can also reduce the area ofcontact between the solders 24 and the electro-conductive members 40 ascompared with the case where the connection is accomplished through thepads.

As shown in this embodiment, provision of the Au film on the Ni film 66can successfully improve the wettability to the solder 14. Similarly forthe case where the Au film is provided on the Cu film 42, thewettability to the solder 24 can be improved.

The interconnects 70 contain a material composing the Ti film 62. Thisconfiguration allows simultaneous formation of a part of, or the entireportion of the interconnects 70 with the Ti film 62, so that increase inthe number of process steps can be suppressed. In particular in thisembodiment, the interconnects 70 have a stacked structure same as thatcomposed of the Ti film 62, the Cu film 64 and the Ni film 66. By thisconfiguration, increase in the number of process steps can moreeffectively be suppressed.

The resin film 50 can more readily be formed when the thickness thereofis 20 μm or smaller, than in the case where the thickness exceeds 20 μm.The solder material composing the solders 24, however, becomes morelikely to reach the interface between the resin film 50 and the Ti film62, as the resin film 50 becomes thinner and thinner, unless the solderis prevented from diffusing by the Ni film 44. This problem becomes moredistinctive, when the thickness of the resin film 50 is 20 μm orsmaller. Therefore in this case, efficacy of providing the Ni film 44becomes particularly large.

In this embodiment, the process steps up to the placement of thesemiconductor chip 10 take place on the supporting substrate 92. Thisconfiguration makes the handling easier, as compared with the case wherethe supporting substrate 92 is not used.

The semiconductor device and the method of manufacturing the sameaccording to the present invention are not limited to the abovedescribed embodiment, and allow various modifications. For example, theelectro-conductive member 40 may be configured by the second diffusionbarrier metal film at least in a part thereof, wherein as shown in FIG.10 the surficial layer on the surface S1 side may be configured by theCu film 42, and the surficial layer on the surface S2 side may beconfigured by the Ni film 44. It is still also allowable that, as shownin FIG. 11, the surficial layers of the electro-conductive member 40 onboth sides may be configured by the Cu films 42, and the Ni film 44 isprovided between both Cu films 42. The entire portion of theelectro-conductive member 40 may be configured by the Ni film.

The above-described embodiment showed the case where another film (Cufilm 64 FIG. 2) is given between the adhesive metal film and the firstdiffusion barrier metal film. However, the first diffusion barrier metalfilm may directly be provided on the adhesive metal film. In otherwords, the adhesive metal film and the first diffusion barrier metalfilm may be in close contact with each other.

The above-described embodiment showed the case where first and secondelectronic circuit components are semiconductor chips. However, thefirst and second electronic circuit components may be interconnectsubstrates. It is still also allowable that either one of the first andsecond electronic circuit components may be a semiconductor chip, andthe other may be an interconnect substrate.

The above-described embodiment showed Ti film as the adhesive metalfilm. However, the adhesive metal film may be a TiN film, W film, TiWfilm, Cr film, Ta film or TaN film. In view of practical value, Ti filmis particularly preferable.

The above-described embodiment showed the Ni film as the first andsecond diffusion barrier metal films. However, the first and seconddiffusion barrier metal films may be a NiV film or the like. In view ofpractical value, Ni film is particularly preferable. It is not alwaysnecessary that the first and second diffusion barrier metal films arethe same, but may be different films.

The above-described embodiment exemplified the resin film as theinsulating film. However, the insulating film may be any insulating filmother than the resin film.

The above-described embodiment exemplified the manufacturing methodusing the supporting substrate. However, use of the supporting substrateis not essential. In other words, the process steps (a) and (f) areomissible from the above-described process steps (a) to (g).

Also the arrangement of the interconnects 70 is not limited to thatshown in FIG. 2, allowing various modifications. FIG. 12 shows anexemplary arrangement of the interconnects 70 in which position of theelectrodes 12 of the semiconductor chip 10 and position of theelectrodes 22 of the semiconductor chip 20 differ from each other. FIG.13 shows an exemplary arrangement of the interconnects 70 in which theelectrodes 12 of the semiconductor chip 10 are connected via theinterconnects 70 to the external electrode terminals 90 (see FIG. 1).The right-hand end of the interconnects 70 are connected to the externalelectrode terminals 90. FIG. 14 shows an exemplary arrangement of theinterconnects 70 in which the electrodes 22 of the semiconductor chip 20are connected via the interconnects 70 to the external electrodeterminals 90. The right-hand ends of the interconnects 70 are connectedto the external electrode terminals 90. FIG. 15 shows an exemplaryarrangement of the interconnects 70 in which the interconnects 70 areconnected to the connective portions 30. It is to be noted that theunderfill resins 84, 86 (see FIG. 2) are not shown in FIG. 12 to FIG.15.

It is also allowable to form the interconnects 70 at the same time withthe connective portions 30. In this case, in the step of subjecting thephotoresist R1 to light exposure and development (see FIG. SC), thephotoresist R1 is removed, as shown in FIG. 16, not only in the portionP30 destined for formation of the connective portions 30, but also inthe portion P70 destined for formation of the interconnects 70. Theinterconnect film 60 is then formed also in this portion P70, and the Cufilm 64 and the Ti film 62 are etched through the interconnect film 60used as a mask. By this process, the interconnects 70 are formedsimultaneously with the connective portions 30. Other process steps aresame as those explained referring to FIG. 4A to FIG. 9B.

It is apparent that the present invention is not limited to the aboveembodiment, and may be modified and changed without departing from thescope and spirit of the invention.

1. A semiconductor device comprising: an insulating film; anelectro-conductive member provided in said insulating film; a firstelectronic circuit component provided on a first surface side of saidinsulating film, and electrically connected to said electro-conductivemember via a first solder; a second electronic circuit componentprovided on a second surface side, which is opposite to said firstsurface side, of said insulating film, and electrically connected tosaid electro-conductive member via a second solder; a first diffusionbarrier metal film provided between said electro-conductive member andsaid first solder, and preventing diffusion of said first solder; asecond diffusion barrier metal film constituting at least a part of saidelectro-conductive member, and preventing diffusion of said secondsolder; and an adhesive metal film provided on said first surface ofsaid insulating film and on said electro-conductive member as beingbrought into contact with said insulating film and saidelectro-conductive member, said adhesive metal film having strongeradhesiveness to said insulating film than adhesiveness of said firstsolder to said insulating film and adhesiveness of said first diffusionbarrier metal film to said insulating film.
 2. The semiconductor deviceas claimed in claim 1, wherein said second diffusion barrier metal filmis in contact with said adhesive metal film.
 3. The semiconductor deviceas claimed in claim 1, wherein said second solder is in contact withsaid electro-conductive member on said second surface of said insulatingfilm.
 4. The semiconductor device as claimed in claim 1, wherein saidadhesive metal film is a Ti film, TiN film, W film, TiW film, Cr film,Ta film or TaN film.
 5. The semiconductor device as claimed in claim 1,wherein each of said first and second diffusion barrier metal film is aNi film or NiV film.
 6. The semiconductor device as claimed in claim 1,further comprising a first Au film provided on said first diffusionbarrier metal film, as being brought into contact with said firstsolder.
 7. The semiconductor device as claimed in claim 1, furthercomprising a second Au film provided on said electro-conductive member,as being brought into contact with said second solder.
 8. Thesemiconductor device as claimed in claim 1, further comprising aninterconnect provided on said first surface of said insulating film, andincluding a material composing said adhesive metal film.
 9. Thesemiconductor device as claimed in claim 1, wherein said insulating filmhas a thickness of 20 μm or smaller.
 10. A method of manufacturing asemiconductor device comprising: forming, in an insulating film, anelectro-conductive member, at least a part of said electro-conductivemember being constituted by a second diffusion barrier metal film;forming, on said insulating film and on said electro-conductive member,an adhesive metal film so that said adhesive metal film is brought intocontact with said insulating film and said electro-conductive member;forming, on said adhesive metal film, a first diffusion barrier metalfilm; placing, on said first diffusion barrier metal film, a firstelectronic circuit component via a first solder so that said firstelectronic circuit component is electrically connected to saidelectro-conductive member; and placing, on a side of said insulatingfilm opposite to said first electronic circuit component, a secondelectronic circuit component via a second solder so that said secondelectronic circuit component is electrically connected to saidelectro-conductive member, wherein said adhesive metal film has strongeradhesiveness to said insulating film than adhesiveness of said firstsolder to said insulating film and adhesiveness of said first diffusionbarrier metal film to said insulating film, and said first and seconddiffusion barrier metal films prevent diffusion of said first and secondsolders, respectively.
 11. The method of manufacturing a semiconductordevice as claimed in claim 10, further comprising: forming saidinsulating film on a supporting substrate, prior to said forming saidelectro-conductive member; and removing said supporting substrate,posterior to said placing said first electronic circuit component, andprior to said placing said second electronic circuit component.